Pinterest is also driving serious traffic for some major brands. It is now driving more traffic than Google+, LinkedIn and MySpace combined.

All of this attention usually brings questions—from your peers, from your boss, from your boss’ boss. So, it helps to have some Pinterest stats ready to share at the drop of a hat. When your boss comes calling—and if Pinterest continues to grow at this rate, someone will ask soon— you can share these 18 stats:

1. Pinterest is retaining and engaging users as much as two to three times as efficiently as Twitter was at a similar time in history. (via RJMetrics)

2. Etsy is the top site in terms of “source domains.” (Source domains are the sites that content on Pinterest links to externally.) Google is second, followed by Flickr, Tumblr, and WeHeartit.com (via RJMetrics)

3. Pinterest accounts for 3.6 percent of referral traffic, while Twitter just barely edged ahead of the newcomer, accounting for 3.61 percent of referral traffic. In July 2011, Pinterest accounted for just 0.17 percent of referral traffic, proving the site’s blockbuster growth. (via PR Daily)

8. Estimated unique visitors to Pinterest.com increased by 429 percent from September to December 2011. (via Monetate)

9. According to comScore (via TechCrunch), the average Pinterest user spends 98 minutes per month on the site, compared to 2.5 hours on Tumblr, and seven hours on Facebook.

10. Daily Pinterest users have increased by more than 145 percent since the beginning of 2012. (via Mashable)

11. More than one-fifth of Facebook-connected users are on Pinterest daily (which represents more than 2,000,000 members). (via Mashable)

12. Top areas of the country for Pinterest users: East South Central (Mississippi, Alabama, Kentucky, Tennessee) and West North Central (Minnesota, Iowa, Missouri, Nebraska, South Dakota and North Dakota).